Re: [Xen-devel] [PATCH v10 4/7] Update IRTE according to guest interrupt config changes

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Feng Wu
> Sent: Thursday, December 03, 2015 4:36 PM
> 
> When guest changes its interrupt configuration (such as, vector, etc.)
> for direct-assigned devices, we need to update the associated IRTE
> with the new guest vector, so external interrupts from the assigned
> devices can be injected to guests without VM-Exit.
> 
> For lowest-priority interrupts, we use vector-hashing mechamisn to find
> the destination vCPU. This follows the hardware behavior, since modern
> Intel CPUs use vector hashing to handle the lowest-priority interrupt.
> 
> For multicast/broadcast vCPU, we cannot handle it via interrupt posting,
> still use interrupt remapping.
> 
> CC: Jan Beulich <jbeulich@xxxxxxxx>
> Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx>
> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx> 

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